B) Defensive adaptation of skin against ultraviolet radiations
C) Drug resistance
D) Darkening of skin due to smoke from industries
Explanation
Industrial melanism is an example of directional selection, changing, environment leading to change in the phenotypic/genotypic constitution of a population.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.